The proposal that the moon is an artificial satellite of Earth, specifically an alien spaceship, a massive UFO, parked in orbit around the Earth, is known as the Spaceship Moon Theory, Artificial Moon Theory, or Alien Moon Theory.
According to proponents of the Spaceship Moon Theory in the UFO community, there is evidence to suggest that the moon was built by an alien civilization with science and technology much more developed than ours.
Read more at http://www.inquisitr.com/1917650/our-moon-is-an-alien-ufo-spaceship-parked-in-orbit-around-earth-ufologists-claim/#pv7WGLSPVDhTie57.99